US5648421AExpiredUtility

Isocyanate/polyol casting resin

71
Assignee: HENKEL KGAAPriority: Jun 18, 1993Filed: Jun 9, 1994Granted: Jul 15, 1997
Est. expiryJun 18, 2013(expired)· nominal 20-yr term from priority
Inventors:Lothar ThieleHans-Peter KohlstadtNicole SchlingloffClaudia Plutniok
Y10T428/249968C08K 3/013E01C 5/20C08G 18/4812Y10T428/249969C08K 3/34E01C 11/225C08G 18/0838C04B 26/16C08K 3/36C08G 18/00Y02A30/30
71
PatentIndex Score
31
Cited by
18
References
31
Claims

Abstract

A composition useful as a casting resin is provided. The composition comprises a polyol, a polyisocyanate, a catalyst, and a suspension aid, and said catalyst and said suspension aid are present in the casting resin in such concentrations that, within 10 minutes of mixing, it flows downwards a) by at least 15 cm at 25° C. and b) by 3 to 0.3 cm at 130° C. The casting resin is particularly useful as a binder for a granular material in the production of open-cell moldings which are permeable to water.

Claims

exact text as granted — not AI-modified
We claim: 
     
       1. A composition useful as a casting resin, said composition comprising: a polyol, a polyisocyanate, a catalyst, and a suspension aid, wherein said catalyst and said suspension aid are present in the casting resin in such concentrations that, within 10 minutes of mixing, the composition flows downwards a) by at least 15 cm at 25° C. and b) by 3 to 0.3 cm at 130° C. 
     
     
       2. A composition as claimed in claim 1 wherein said composition has an isocyanate excess of up to 50%, based on reactive hydroxyl groups. 
     
     
       3. A composition as claimed in claim 1 wherein said composition has an isocyanate excess of 10 to 30%, based on reactive hydroxyl groups. 
     
     
       4. A composition as claimed in claim 1 wherein said catalyst is an organotin catalyst. 
     
     
       5. A composition as claimed in claim 1 wherein said catalyst is an organotin catalyst with a molecular weight of more than 250. 
     
     
       6. A composition as claimed in claim 1 wherein said catalyst is an organotin catalyst with a molecular weight of more than 600. 
     
     
       7. A composition as claimed in claim 1 wherein said suspension aid contains silicon. 
     
     
       8. A composition as claimed in claim 1 wherein said suspension aid is selected from the group consisting of bentonites and highly disperse silica. 
     
     
       9. A composition useful as a casting resin, said composition comprising: a polyol, a polyisocyanate, said polyisocyanate being in excess of 10 to 30%, based on reactive hydroxyl groups, an organotin catalyst with a molecular weight of more than 600, and a suspension aid selected from the group consisting of bentonites and highly disperse silica, wherein said organotin catalyst and said suspension aid are present in the casting resin in such concentrations that, within 10 minutes of mixing, the composition flows downwards a) by at least 15 cm at 25° C. and b) by 3 to 0.3 cm at 130° C. 
     
     
       10. A process for the production of open-cell moldings comprising casting a mixture of a granular material with a composition as claimed in claim 1. 
     
     
       11. A process as claimed in claim 10 wherein the casting product has a cell volume of 30 to 50% by volume and permeability to water. 
     
     
       12. A process as claimed in claim 10 wherein up to 10% by weight of the granular material is smaller than 1.0 mm in diameter. 
     
     
       13. A process as claimed in claim 10 wherein the granular material is selected from the group consisting of gravel, sand, and mixtures thereof. 
     
     
       14. A process as claimed in claim 10 wherein said granular material is further comprised of dust. 
     
     
       15. A process as claimed in claim 10 wherein up to 5% by weight of the granular material is smaller than 0.2 mm in diameter. 
     
     
       16. A process as claimed in claim 10 wherein the granular material is pretreated with the polyol component or with the resin produced therefrom. 
     
     
       17. Open-cell moldings comprising a granular material and a binder therefor which binder is the reaction product of a casting resin comprising a mixture of a polyol and a polyisocyanate a catalyst and a suspension aid, wherein said catalyst and said suspension aid are present in the casting resin in such concentrations that, within 10 minutes of mixing, it flows downwards a) by at least 15 cm at 25° C. and b) by 3 to 0.3 cm at 130° C., said open-cell molding having a cell volume of 30 to 50% by volume. 
     
     
       18. An open-cell molding as claimed in claim 17 wherein said molding does not affect water in contact with them to a significant extent, if at all, after one week. 
     
     
       19. An open-cell molding as claimed in claim 17 wherein said mixture of a polyol and a polyisocyanate has an isocyanate excess of up to 50%, based on reactive hydroxyl groups. 
     
     
       20. An open-cell molding as claimed in claim 17 wherein said mixture of a polyol and a polyisocyanate has an isocyanate excess of 10 to 30%, based on reactive hydroxyl groups. 
     
     
       21. An open-cell molding as claimed in claim 17 wherein said catalyst is an organotin catalyst. 
     
     
       22. An open-cell molding as claimed in claim 17 wherein said catalyst is an organotin catalyst with a molecular weight of more than 250. 
     
     
       23. An open-cell molding as claimed in claim 17 wherein said catalyst is an organotin catalyst with a molecular weight of more than 600. 
     
     
       24. An open-cell molding as claimed in claim 17 wherein said suspension aid contains silicon. 
     
     
       25. An open-cell molding as claimed in claim 17 wherein said suspension aid is selected from the group consisting of bentonites and highly disperse silica. 
     
     
       26. An open-cell molding as claimed in claim 17 wherein up to 10% by weight of the granular material is smaller than 1.0 mm in diameter. 
     
     
       27. An open-cell molding as claimed in claim 17 wherein the granular material is selected from the group consisting of gravel, sand, and mixtures thereof. 
     
     
       28. An open-cell molding as claimed in claim 17 wherein said granular material is further comprised of dust. 
     
     
       29. An open-cell molding as claimed in claim 17 wherein up to 5% by weight of the granular material is smaller than 0.2 mm in diameter. 
     
     
       30. An open-cell molding as claimed in claim 17 wherein the granular material is pretreated with the polyol component or with the resin produced therefrom. 
     
     
       31. Open-cell moldings comprising a granular material and a binder therefor which binder is the reaction product of a casting resin comprising mixture of a polyol and a polyisocyanate, said polyisocyanate being in excess of 10 to 30%, based on reactive hydroxyl groups, an organotin catalyst with a molecular weight of more than 600, and a suspension aid selected from the group consisting of bentonites and highly disperse silica, wherein said organotin catalyst and said suspension aid are present in the casting resin in such concentrations that, within 10 minutes of mixing, it flows downwards a) by at least 15 cm at 25° C. and b) by 3 to 0.3 cm at 130° C.

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